1 files changed, 32 insertions, 0 deletions

diff --git a/include/linux/circ_buf.h b/include/linux/circ_buf.h
new file mode 100644
index 000000000000..a2ed0591fb19
--- /dev/null
+++ b/include/linux/circ_buf.h
@@ -0,0 +1,32 @@
+#ifndef _LINUX_CIRC_BUF_H
+#define _LINUX_CIRC_BUF_H 1
+
+struct circ_buf {
+        char *buf;
+        int head;
+        int tail;
+};
+
+/* Return count in buffer.  */
+#define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1))
+
+/* Return space available, 0..size-1.  We always leave one free char
+   as a completely full buffer has head == tail, which is the same as
+   empty.  */
+#define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size))
+
+/* Return count up to the end of the buffer.  Carefully avoid
+   accessing head and tail more than once, so they can change
+   underneath us without returning inconsistent results.  */
+#define CIRC_CNT_TO_END(head,tail,size) \
+        ({int end = (size) - (tail); \
+          int n = ((head) + end) & ((size)-1); \
+          n < end ? n : end;})
+
+/* Return space available up to the end of the buffer.  */
+#define CIRC_SPACE_TO_END(head,tail,size) \
+        ({int end = (size) - 1 - (head); \
+          int n = (end + (tail)) & ((size)-1); \
+          n <= end ? n : end+1;})
+
+#endif /* _LINUX_CIRC_BUF_H  */